Ok, so I repainted the Chevelle after it sat for a couple weeks with no mottling but it got solvent pops only on the fenders. Can I scuff and reclear over the pops or do I need to block reprime and reshoot them?
With nice flat panels like bonnets and doors it is easy to get the correct paint thickness with your gun distance from the panel and overlap. When you come to guards then it can become trickier because most people spray following the curve of the wheel arch and then go to a horizontal movement once they get above the arch. Very easy to get more paint thickness here and in the curve on the top of the guard as your overlap increases to compensate for a heavy middle because it is closer to the gun.
Depending on ambient temperature an hour flash before clear should be enough but if your base was overly thick in these areas and flash between coats insufficient then solvent pop is a possibility. Other possibilities include reducer choice, force drying of base, air flow in the booth….the list goes on. Really a bit hard to be definitive without having seen the application.
If you can 800 it smooth without opening the solvent pops it will be okay to reshoot but if the turn into littlewhite dots while ssand in they will have to be removed completely before relocating. Pops often will happen if the Gardner/ rescuers are too fast for the temp you are spraying in. Even with dry base the clear can skim over trapping its own solvents. Try choking up the gun and giving a little more flash time between coats. Also check to make sure the temperature of the vehicle matches the clear you are mixing. Good luck!